package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.controller.user.ShoppingCartController;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {//dishId或者setmealId 和口味（可为空）
        //判断购物车中是否已经存在此商品

        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //通过线程获取已经存储的用户id
        Long userId= BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);



        if(list!=null&&list.size()>0){
            //如果已经存在，就需要把它的数量＋1，
            ShoppingCart cart=list.get(0);
            cart.setNumber(cart.getNumber()+1);
            //然后更新一下数据库，让购物车表中的数量也改变
            shoppingCartMapper.updateNumberById(cart);
        }else{//不存在 插入菜品或套餐
            //判断传过来的是套餐还是菜品
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                //是菜品,获取到菜品的完整信息：
                Dish dish=dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());

            }else//否则添加进来的是套餐
            {

                Long setmealId=shoppingCartDTO.getSetmealId();

                Setmeal setmeal=setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());


            }
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用户的id
        Long userId=BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                .userId(userId)
                .build();
       List<ShoppingCart> list= shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart(){
        //获取当前微信用户的id
        Long userId=BaseContext.getCurrentId();
        shoppingCartMapper.delete(userId);
    }
}
